Under what drainage threshold would you consider notifying the clinician about a possible continuous bleeding?

• A. If drainage is persistently bright red or exceeds >200 mL in 1 hour or a concerning 24-hour total.
• B. If there is air in the suction chamber.
• C. If there is any drainage at all.
• D. If drainage is clear.

Answer: (A)

Monitoring chest tube drainage is a key way to detect ongoing bleeding after chest tube placement. When drainage remains persistently bright red or when the amount of drainage is high—specifically more than about 200 mL in one hour—it's a red flag that active bleeding may be occurring and warrants clinician evaluation. A concerning 24-hour total volume also signals that bleeding isn’t resolving and needs assessment, even if hourly rates fluctuate.

The other signs don’t point to bleeding in the same way. An air in the suction chamber suggests an air leak or pneumothorax and is a different complication. Any drainage at all can be normal immediately after surgery, depending on the procedure and timing, and clear drainage is typically not alarming for bleeding.